CN210687124U - Stop check valve - Google Patents

Abstract

The utility model provides a stop check valve, include: the valve comprises a valve body, a valve seat, a valve rod and a valve clack, wherein the valve seat is positioned at the bottom end of the valve rod, and the valve clack is positioned between the valve seat and the valve rod. The valve rod is not connected with the valve clack, and when the valve rod rises to the maximum opening degree, the stop check valve plays a check valve role. Through seting up the intercommunicating pore at the lateral wall of valve clack, the inside and outside hydraulic pressure balance of valve clack, the valve clack can be ensured completely under its action of gravity to press on the disk seat. This structure can avoid using the spring to the sensitivity of ending the check valve has been improved.

Description

Stop check valve

Technical Field

The utility model relates to a stop check valve.

Background

The stop check valve is a valve with a valve clack moving along the central line of the valve body and a valve rod not fixedly connected with the valve clack, and has the functions of a stop valve and a check valve. When the valve rod descends to press the valve clack on the valve seat, the valve rod plays a role of a stop valve; the valve rod acts as a check valve after rising. The valve has the advantages of small friction force between sealing surfaces, long service life, small opening height, low manufacturing cost, convenient maintenance and the like in the opening and closing processes, so that the valve is widely applied to the fields of petrochemical industry, ships, power stations, metallurgy and the like.

The prior art product of the stop check valve mainly comprises a valve body, a valve clack, a valve rod, a valve cover and the like, and when the valve body stops the check reversely, the valve seat is blocked mainly by the gravity of the valve clack and the elastic action of a spring pressing the valve clack on the valve seat. The disadvantages of this construction are: when the pipeline is positively communicated, the gravity of the valve clack and the elastic force of the spring need to be overcome, and the sensitivity of the stop check valve is influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a by the check valve in order to overcome the not high defect of sensitivity that switches on by the check valve among the prior art.

The utility model discloses an above-mentioned technical problem is solved through following technical scheme:

a check valve, comprising: the valve comprises a valve body, a valve seat, a valve rod and a valve clack, wherein the valve seat is positioned at the bottom end of the valve rod, and the valve clack is positioned between the valve seat and the valve rod.

Preferably, the stop check valve further comprises a valve cover, the valve cover covers the valve body, an annular protrusion is arranged on the surface of the valve cover facing the valve body, an annular groove is formed in the surface of the valve cover facing the valve body, the annular protrusion is matched with the annular groove, and a sealing ring is arranged between the annular groove and the annular protrusion.

Preferably, the valve cover is provided with a through hole, the valve rod is inserted into the through hole, the inner wall of the through hole is provided with an annular step, and the annular step is filled with a stuffing box which is abutted against the valve rod.

Preferably, the check valve further comprises a packing gland fixed to the valve cover and pressed against the top of the stuffing box.

Preferably, the check valve further comprises a stem nut rotatably coupled to the bonnet, the stem nut being threadably coupled to the stem.

Preferably, the stop check valve further includes a rotation preventing block fixed to the valve rod, the valve cover has a guide portion extending in an axial direction of the valve rod, and the rotation preventing block is capable of moving in an extending direction of the guide portion.

Preferably, the end part of the rotation prevention block is provided with a rotation prevention surface, the guide part is provided with a guide surface, and the rotation prevention surface is matched with the guide surface.

Preferably, the guide part is provided with a sign, and the sign corresponds to the anti-rotation block.

Preferably, the stop check valve further comprises a nut gland fixed to the valve cap, and the nut gland is used for blocking the valve rod nut from moving along the axial direction.

Preferably, the stop check valve further comprises a handwheel, and the handwheel is sleeved on the valve stem nut and fixed on the valve stem nut.

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The utility model discloses an actively advance the effect and lie in: the valve rod is not connected with the valve clack, and when the valve rod rises to the maximum opening degree, the stop check valve plays a check valve role. Through seting up the intercommunicating pore at the lateral wall of valve clack, the inside and outside hydraulic pressure balance of valve clack, the valve clack can be ensured completely under its action of gravity to press on the disk seat. This structure can avoid using the spring to the sensitivity of ending the check valve has been improved.

Drawings

Fig. 1 is a schematic perspective view of a check valve according to a preferred embodiment of the present invention.

Fig. 2 is a schematic view of a partial cross-sectional structure of a check valve according to a preferred embodiment of the present invention.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Description of reference numerals:

valve body 100

Annular groove 110

Valve seat 200

Valve stem 300

Valve flap 400

Groove 410

Communication hole 420

Valve cover 500

Annular projection 510

Through hole 520

Annular step 521

Guide part 530

Guide surface 531

Signboard 532

Seal ring 600

Stuffing box 710

Packing gland 720

Valve stem nut 800

Nut gland 810

Anti-rotation block 900

Anti-rotation surface 910

Hand wheel 1000

Detailed Description

The present invention will be more clearly and completely described below with reference to the accompanying drawings.

Fig. 1 and 2 show a check valve comprising: the valve comprises a valve body 100, a valve seat 200, a valve rod 300 and a valve clack 400, wherein the valve seat 200 is positioned at the bottom end of the valve rod 300, the valve clack 400 is positioned between the valve seat 200 and the valve rod 300, a groove 410 is axially formed in the valve clack 400, the valve rod 300 is used for being inserted into the groove 410, a plurality of communication holes 420 are formed in the side wall of the valve clack 400, and the communication holes 420 are communicated with the groove 410.

In this case, when the cut-off check valve functions as a cut-off, the valve rod 300 presses the valve flap 400 against the valve seat 200, so that the valve seat 200 is in a cut-off state. When the valve rod 300 is far away from the valve clack 400 and the stop check valve acts as a check valve, liquid enters one side of the valve body 100 through a pipeline and then is filled in the valve clack 400 and the periphery through the communication hole 420 and the groove 410, so that the inside and the outside of the valve clack 400 are balanced hydraulically, and the valve clack 400 can be pressed on the valve seat 200 by the self-gravity thereof, and the stop check valve is ensured to be in a disconnection state; when the liquid enters the other side of the valve body 100 through the pipe, the valve flap 400 is lifted up through the hole of the valve seat 200, so that the check valve is in a conductive state. The device reduces the spring structure used by the conventional stop check valve, so that the liquid pressure only needs to overcome the gravity of the valve clack 400, and the sensitivity of the turn-on of the stop check valve is improved.

The stop check valve further comprises a valve cover 500, the valve cover 500 covers the valve body 100, an annular protrusion 510 is arranged on the surface of the valve cover 500 facing the valve body 100, an annular groove 110 is arranged on the surface of the valve body 100 facing the valve cover 500, the annular protrusion 510 is matched with the annular groove 110, and a sealing ring 600 is arranged between the annular groove 110 and the annular protrusion 510. The annular protrusion 510 is matched with the annular groove 110, so that the two are accurately aligned and assembled. The sealing ring 600 can prevent the liquid leakage of the check valve.

The bonnet 500 is provided with a through hole 520, the valve rod 300 is inserted into the through hole 520, the inner wall of the through hole 520 is provided with an annular step 521, and the annular step 521 is filled with a stuffing box 710 abutted against the valve rod 300. The check valve further includes a packing gland 720, and the packing gland 720 is fixed to the valve cap 500 and pressed against the top of the packing box 710. The packing box 710 serves to seal the valve stem 300 from the inner wall of the through-hole 520 while reducing friction with the valve stem 300 and preventing the valve stem 300 from being caught.

The check valve further includes a stem nut 800, the stem nut 800 being rotatably coupled to the bonnet 500, the stem nut 800 being threadedly coupled to the valve stem 300. The movement of the valve stem 300 can be achieved by turning the stem nut 800, thereby changing the positional relationship between the valve stem 300 and the valve flap 400, so that the check valve performs different functions.

As will be understood from fig. 3, in order to prevent the stem nut 800 from rotating when the stem nut 800 rotates, the stop check valve further includes an anti-rotation block 900, the anti-rotation block 900 is fixed to the stem 300, the bonnet 500 has a guide portion 530, the guide portion 530 extends in the axial direction of the stem 300, and the anti-rotation block 900 can move in the extending direction of the guide portion 530.

In this embodiment, the rotation prevention block 900 has a rotation prevention surface 910 at an end thereof, the guide portion 530 has a guide surface 531, and the rotation prevention surface 910 is matched with the guide surface 531. The guide surface 531 functions to block the rotation of the rotation preventing surface 910 while guiding the rotation preventing surface 910 to move in the extending direction thereof.

In this scheme, guide part 530 is equipped with sign 532, and sign 532 is corresponding with preventing changeing piece 900. The indicator marks on the indicator plate 532 correspond to the position of the anti-rotation block 900 so that different positions of the valve stem 300, i.e., different operating states of the check valve, can be displayed.

The stop check valve further includes a nut cover 810, the nut cover 810 is fixed to the bonnet 500, and the nut cover 810 blocks the stem nut 800 from moving in an axial direction. In this embodiment, the bottom of the stem nut 800 has a protrusion, the nut cover 810 is sleeved on the stem nut 800, and the bottom of the nut cover 810 is used to block the protrusion from moving horizontally. To secure the nut cover 810 to the bonnet 500, the nut cover 810 is screwed to the bonnet 500 by a set screw.

The stop check valve further comprises a handwheel 1000, and the handwheel 1000 is sleeved on the valve stem nut 800 and fixed on the valve stem nut 800. The hand wheel 1000 is used for conveniently rotating the valve rod nut 800, and the operation is convenient.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims (10)

1. A check valve, comprising: the valve comprises a valve body, a valve seat, a valve rod and a valve clack, wherein the valve seat is positioned at the bottom end of the valve rod, and the valve clack is positioned between the valve seat and the valve rod.

2. The check valve of claim 1, further comprising a valve cover covering the valve body, wherein an annular protrusion is formed on a surface of the valve cover facing the valve body, an annular groove is formed on a surface of the valve body facing the valve cover, the annular protrusion is matched with the annular groove, and a sealing ring is arranged between the annular groove and the annular protrusion.

3. The stop-check valve as claimed in claim 2, wherein said valve cover has a through hole, the valve stem is inserted into said through hole, and an annular step is formed on an inner wall of said through hole and filled with a packing box abutting against said valve stem.

4. The stop check valve of claim 3, further comprising a packing gland secured to the valve cover and pressed against the top of the stuffing box.

5. The check valve of claim 4, further comprising a stem nut rotatably coupled to the bonnet, the stem nut being threadably coupled to the stem.

6. The stop-check valve as claimed in claim 5, further comprising a rotation preventing block fixed to the stem, the cap having a guide portion extending in an axial direction of the stem, the rotation preventing block being movable in an extending direction of the guide portion.

7. The check valve of claim 6, wherein the end of the anti-rotation block has an anti-rotation surface, and the guide portion has a guide surface, the anti-rotation surface mating with the guide surface.

8. The stop-check valve as claimed in claim 6, wherein said guide portion is provided with a direction plate corresponding to said rotation preventing piece.

9. The check valve of claim 6, further comprising a nut gland secured to the bonnet, the nut gland for blocking axial movement of the stem nut.

10. The check valve of claim 9, further comprising a handwheel that is fitted over and secured to the stem nut.

Images